1. 3x - 6+9y
2.21x-28

Step-by-step explanation:

x

=

2

−

3

y

3

x

+

9

y

=

6

Replace all occurrences of

x

in

3

x

+

9

y

=

6

with

2

−

3

y

.

x

=

2

−

3

y

3

(

2

−

3

y

)

+

9

y

=

6

Simplify

3

(

2

−

3

y

)

+

9

y

.

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x

=

2

−

3

y

6

=

6

Since

6

=

6

, the equation will always be true.

x

=

2

−

3

y

Always true

Remove any equations from the system that are always true.

x

=

2

−

3

y

step-by-step explanation:

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation: